Low-resolution (250-m) gridded bathymetry and shaded relief image (CCALBATG, CCALSHD.TIF) of the region offshore of central California between Point Reyes and San Simeon

Frequently-anticipated questions:

• What does this data set describe?
  1. How should this data set be cited?
  2. What geographic area does the data set cover?
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
  5. What is the general form of this data set?
  6. How does the data set represent geographic features?
  7. How does the data set describe geographic features?
• Who produced the data set?
  1. Who are the originators of the data set?
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
• Why was the data set created?
• How was the data set created?
  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
  3. What similar or related data should the user be aware of?
• How reliable are the data; what problems remain in the data set?
  1. How well have the observations been checked?
  2. How accurate are the geographic locations?
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
  5. How consistent are the relationships among the data, including topology?
• How can someone get a copy of the data set?
  1. Are there legal restrictions on access or use of the data?
  2. Who distributes the data?
  3. What's the catalog number I need to order this data set?
  4. What legal disclaimers am I supposed to read?
  5. How can I download or order the data?
• Who wrote the metadata?

Title:

Low-resolution (250-m) gridded bathymetry and shaded relief image (CCALBATG, CCALSHD.TIF) of the region offshore of central California between Point Reyes and San Simeon

Abstract:

CCALBATG is a 250-m grid of the on- and offshore elevation of the central California region between Point Reyes in the north and San Simeon in the south based on USGS and NOAA data. CCALSHD.TIF is a shaded relief image of the same region at a resolution of 150-m.

This is one of a collection of digital files of a geographic information system of spatially referenced data related to the USGS Coastal and Marine Geology Program "Monterey Bay National Marine Sanctuary Project" <http://walrus.wr.usgs.gov/mbms>. The data were collected and analyzed between 1994 and 2000.

1. How should this data set be cited?

   Maher, Norman, and Wong, Florence L. , 2001, Low-resolution (250-m) gridded bathymetry and shaded relief image (CCALBATG, CCALSHD.TIF) of the region offshore of central California between Point Reyes and San Simeon:.

   Online Links:

   • <http://geopubs.wr.usgs.gov/open-file/of01-179>

   This is part of the following larger work.

   Wong, F.L., and Eittreim, S.E., 2001, Continental Shelf GIS for the Monterey Bay National Marine Sanctuary: U.S. Geological Survey Open-File Report 01-179, U.S. Geological Survey, Menlo Park, CA.

   Online Links:

   • <http://geopubs.wr.usgs.gov/open-file/of01-179/>

2. What geographic area does the data set cover?

   West_Bounding_Coordinate: -124.0277964

   East_Bounding_Coordinate: -120.94401369

   North_Bounding_Coordinate: 38.01131059

   South_Bounding_Coordinate: 35.48876841

3. What does it look like?

   <http://geopubs.wr.usgs.gov/open-file/of01-179/images/shdccal.gif> (GIF)

   location map of ccalbatg

4. Does the data set describe conditions during a particular time period?

   Calendar_Date: 1994

   Currentness_Reference: Ground Condition

5. What is the general form of this data set?

   Geospatial_Data_Presentation_Form: map

6. How does the data set represent geographic features?
   1. How are geographic features stored in the data set?

      This is a Raster data set. It contains the following raster data types:

      • Dimensions 1114 x 1083, type Grid Cell

   2. What coordinate system is used to represent geographic features?

      Grid_Coordinate_System_Name: Universal Transverse Mercator

      Universal_Transverse_Mercator:

      UTM_Zone_Number: 10

      Transverse_Mercator:

      Scale_Factor_at_Central_Meridian: 0.9996

      Longitude_of_Central_Meridian: -123.00000

      Latitude_of_Projection_Origin: 0.00000

      False_Easting: 500000.00

      False_Northing: 0.00

      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 250.0
      Ordinates (y-coordinates) are specified to the nearest 250.0
      Planar coordinates are specified in Meters

      The horizontal datum used is North American Datum of 1983.
      The ellipsoid used is GRS1980.
      The semi-major axis of the ellipsoid used is 6378137.0.
      The flattening of the ellipsoid used is 1/298.257.
      

7. How does the data set describe geographic features?

   Entity_and_Attribute_Overview:

   The bathymetry grid CCALBATG has the following properties

    Cell Size =             250.000 m
    Number of Rows    =        1114
    Number of Columns =        1083
    Data Type:            Floating Point
   
               BOUNDARY (UTM m)    DEGREES
   
    Xmin =     409874.219      -124.02780
    Xmax =     680624.219      -120.94401
    Ymin =    3928874.250        35.48877
    Ymax =    4207374.250        38.01131
   
    Minimum Value =            -3931.002 m
    Maximum Value =             1740.000
    Mean          =            -1291.745
    Standard Deviation =        1619.729
   

   The shaded relief image CCALSHD.TIF has the following attributes:

    Image Format :              TIFF
    Image Type :           GRAYSCALE
    Image Colormap :           FALSE
    Image Compressed :         FALSE
    Image Rotated :            FALSE
   
    Image Depth =                     8
    Image Bands =                     1
    Number of Columns =            1486
    Number of Rows =               1837
    Pixel Size DX =           153.55271 m
    Pixel Size DY =           153.55271
   
            BOUNDARY (UTM m)   DEGREES
   
    Xmin =    453448.17574    -123.53043
    Ymin =   3927119.00783      35.47100
    Xmax =    681627.50114    -120.93105
    Ymax =   4209195.33404      38.02927
   

   Entity_and_Attribute_Detail_Citation: none

1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
   • Norman Maher
   • Florence L. Wong

2. Who also contributed to the data set?

3. To whom should users address questions about the data?

   Florence L. Wong
   United States Geological Survey (USGS)
   Geologist, GIS Coordinator
   USGS, MailStop 999, 345 Middlefield Road
   Menlo Park, CA 94025-3561
   USA
   

   (650) 329-5327 (voice)
   (650) 329-5190 (FAX)
   fwong@usgs.gov
   

These data are intended for science researchers, students, policy makers, and the general public. The data can be used with geographic information systems (GIS) software to display geologic and oceanographic information about the shallower areas of the Monterey Bay National Marine Sanctuary.

1. From what previous works were the data drawn?

2. How were the data generated, processed, and modified?

   Date: 1994 (process 1 of 3)

   Norman Maher assembled the 250-m grid CCALBATG from USGS and NOAA data. The exact sources are not known.

   Date: 1998 (process 2 of 3)

   Unregistered shaded relief with 150-m resolution of slightly smaller window supplied by Norman Maher. FLW registered to coastline file with about 400m precision and converted to TIFF image CCALSHD.TIF.

   Date: 27-Mar-2001 (process 3 of 3)

   First draft of metadata created by F.L. Wong using a modified version of FGDCMETA.AML on ARC/INFO data set CCALBATG

3. What similar or related data should the user be aware of?

1. How well have the observations been checked?

2. How accurate are the geographic locations?

3. How accurate are the heights or depths?

4. Where are the gaps in the data? What is missing?

   Date are missing for the 15-minute quadrangle in the southwest corner of the map extent.

5. How consistent are the relationships among the observations, including topology?

   Not applicable for raster data.

Are there legal restrictions on access or use of the data?

Access_Constraints: None

Use_Constraints:

Please recognize the U.S. Geological Survey (USGS) as the source of this information.

Although these data have been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data.

The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of this data, software, or related materials.

This information is not intended for navigational purposes.

Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

1. Who distributes the data set? (Distributor 1 of 1)

   United States Geological Survey (USGS)
   c/o Florence L. Wong
   Geologist, GIS Coordinator
   USGS, MailStop 999, 345 Middlefield Road
   Menlo Park, CA 94025-3561
   USA
   

   (650) 329-5327 (voice)
   (650) 329-5190 (FAX)
   fwong@usgs.gov
   

2. What's the catalog number I need to order this data set?

   USGS Open-File Report 01-179

3. What legal disclaimers am I supposed to read?

   Please recognize the U.S. Geological Survey (USGS) as the source of this information.

   Although these data have been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data.

   Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

   The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of this data, software, or related materials.

4. How can I download or order the data?
   • Availability in digital form:

     Data format:	bathymetry grid; shaded relief image in format ArcInfo GRID, TIFF (version 8.0.2) Size: 5 Mb grid; 3 Mb tiff
     Network links:	<http://geopubs.wr.usgs.gov/open-file/of01-179/>

   • Cost to order the data: none

Dates:

Last modified: 27-Mar-2001
Last Reviewed: May-2001

Metadata author:

United States Geological Survey (USGS)
c/o Florence L. Wong
Geologist, GIS Coordinator
USGS, MailStop 999, 345 Middlefield Road
Menlo Park, CA 94025-3561
USA

(650) 329-5327 (voice)
(650) 329-5190 (FAX)
fwong@usgs.gov

Metadata standard:

Content Standard for Digital Geospatial Metadata ("CSDGM version 2") (FGDC-STD-001-1998)